I know Ball Pythons need their Night/Day cycle but at night it gets way to cold without the lamp on, I have them housed in I believe a 20 gallon tank but I never measured it. I don't have anything for insulation around the sides yet but I'm wondering if it will help enough going from 90 on the warm side to low 70's which when I woke up and realized I quickly turned on the lamp. The UTH is always on but that doesn't give off nearly enough heat. Any ideas on what's good to insulate the glass cage?